Is photosynthesis an exothermic reaction?

Photosynthesis is an endothermic reaction. This means it cannot occur without energy (from the Sun).

Which process of Calvin cycle requires RuBP?

Stage 1: Fixation RuBisCO catalyzes a reaction between CO2 and RuBP. For each CO2 molecule that reacts with one RuBP, two molecules of 3-phosphoglyceric acid (3-PGA) form. 3-PGA has three carbons and one phosphate. Each turn of the cycle involves only one RuBP and one carbon dioxide and forms two molecules of 3-PGA.

What process occurs in both light and dark?

– The process of photosynthesis occurs in two stages, the light dependent (light) and light independent (dark) stages. It is important to appreciate that both stages go on simultaneously, that’s assuming that light is provided.

Is oxygen used in dark reactions?

The reason these two processes occur at the same time is that photorespiration uses oxygen while giving out carbon dioxide and the dark reaction of photosynthesis uses carbon dioxide while giving out oxygen.

Is photosynthesis Endergonic or exothermic?

Photosynthesis is an endergonic process. Photosynthesis takes in energy and uses it to build carbon compounds. used in plant tissues.

What is the main result of the Calvin cycle?

The reactions of the Calvin cycle add carbon (from carbon dioxide in the atmosphere) to a simple five-carbon molecule called RuBP. These reactions use chemical energy from NADPH and ATP that were produced in the light reactions. The final product of the Calvin cycle is glucose.

What are the two main steps in photosynthesis?

There are two main stages of photosynthesis: the light-dependent reactions and the Calvin cycle. Requires sunlight? Schematic of the light-dependent reactions and Calvin cycle and how they’re connected. The light-dependent reactions take place in the thylakoid membrane.

Why are light and dark reactions important in photosynthesis?

What is the importance of the light and dark reactions in photosynthesis? During the light reactions of photosynthesis, light energy from the sun is captured and used to make ATP and NADPH. During the dark reactions, ATP, NADPH, and carbon dioxide combine to make glucose and other compounds.

What is difference between light and dark reaction?

The main difference between light and dark reaction is that light reaction is the first stage of photosynthesis, which traps light energy in order to produce ATP and NADPH whereas dark reaction is the second stage of photosynthesis, which produces glucose by using the energy form ATP and NADPH produced from the light …

Can the dark reaction occur in light?

No, the dark reaction does not occur at night. It occurs during the day, but the reaction does not use the light directly. Therefore, it is known as the dark reaction.

How are light and dark reactions related in photosynthesis?

1) Light-dependent reaction (LIGHT Reaction) ◦ Requires light ◦ Occurs in chloroplast (in thylakoids) ◦ Chlorophyll (thylakoid) traps energy from light ◦ Light excites electron (e-)  Kicks e- out of chlorophyll to an electron transport chain  Electron transport chain: series of proteins in thylakoid membrane

Where does the light energy go in photosynthesis?

The light-dependent or “Light” Reactions: •convert sunlight energy into chemical energy (stored in ATP & NADPH) “Dark” Reactions (Calvin cycle): •use chemical energy from light reactions to make glucose Light H 2O CO 2 Chloroplast LIGHT REACTIONS (in thylakoids) CALVIN CYCLE (in stroma) NADP+

Where do dark reactions occur in the chloroplast?

Dark reactions ( Enzymatic reactions ) is a group of reactions that occurs in the stroma of chloroplast in which the temperature is the limiting factor for the rate of photosynthesis , so , these reactions can occur in both the light and darkness .

Where do the light and dark reactions take place?

The light reactions of photosynthesis take place in the thylakoid membrane, whereas the dark reactions are located in the chloroplast stroma. Photosynthetic electron and proton transfer chain The light-driven electron transfer reactions of photosynthesis begin with the splitting of water by Photosystem II (PSII).